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R. W. HAGEN.

Dec. 31, 1929.

DRUMA original Filed Feb. 1, 192:5

Reissued Dec. 31, 1929 p UNITED STATES PATENT OFFICE DRUK mal lo.1,615,308, dated January 18, 1927, Serial No. 616,308, led ebx'uary 1,1928. Application for reissue led October 19,1928. Serial No. 313,600. i

Futher object of the invention is to amplify and improve theconstruction of drums and particularly the tension devices for the Y 10heads. Further advantages will be better apparent from a detaileddescription of the invention in connection with accompanying drawings,in which- Fig. 1 is a plan view of a drum embodying u minvention.

i 2 is an enlarged sectional view substantrally along the line 2-2 ofFig. 1.

Fi 3 is an enlarged sectional view substantially along the line 3-3 ofFig. 2; and l Fig. 4 is a. detail sectional view substantially .alongthe line 4 4 of Fig. 3.

In the construction shown 1n the drawings, the body of the drum isformedby two annular parts 1 and 2, preferably formed of metal.

lo The parts 1 and 2 are formed with channel portions 3 and 4respectively which extend outwardly from the plane of the upper andlowermost extremities of the drum body. These channels, it will beobserved intert. 30 In assembling the parts 1 and 2 together, the freemargin of the channel portion 4, is left as forming a continuation ofsaid channel portion and the other channel ortion 3 is then insertedtherein, after whic said marginal portion is turned or spun inwardlyupon t e annular flange part of said channel portion 3. In the annularfla-nge parts of the channel Portions is a plurality of tubular bolts ors eeves 5 each witha head on the outside of said flange arts. The innerend of the sleeve 5 is threa ed and a'nut 6 is screwed thereon.Positioned between the nut 6 and the adjacent wall of the channelportion of the drum body will be found an angle clip 7 which furtherstrengthens the parts and which is also held in place by said nut. Thusall of the parts are rigidly held in desired placed position by thestructure described.

The sleeve 5 is also internally threaded as 60 indicated at 8 andaccommodates the threadis provided. f

ed end `portion 10'of the rod 9. There are a plurality of these variousparts but inasmuch as the construction of all are alike, a descriptionof the construction and operation of-one thereof will suice for all.,The upper end of the rod 9 extends through a clip 11 which engages thetension hoop 12. The tension. hoop 12, in turn, bears against the ring13 around whichis disposed the flesh hoop l5 to ywhich the head vellumor skin 14 is secured. The outer end of the rodv 9A is preferablysquared so that it can be rotated by means of a key. By turning the rod9 the flesh hoop 15 can be moved axially of the drum, eitherxto stretchy or loosen the head Vellum or vskin 14 to bring the same to thedesiredstate of tension.

Y It will be observed that the channel portion .of the drum extendsoutwardly beyond the plane ofthe ad'ustable rods so that all danger -Aof injuring or isturbing the rods by engagement Kwith extraneousarticles is eliminated. Furthermore by the construction illustrated anextremely ri d durable andellicient drum erforms another importantfunction in that 1t acts as an expansion chamber for thesound vwaves setin motion iny the layin ofthe drum, so that overtones are a sorbetherein and cannot produce rattling and other objec- -tionable noises.Againtheangle clips 7 are important because they assist 1n ri diffyingthe drum shell which is made of t inv sheet yimetal.

Suchreenforcing or bracing is im ortant view of the tension exerted upont e resonating chamber formedvby the channelportions 3 and 4, andanylmethod of reenforcement that will accomplish its object is contem latedby the invention.- It mightybe dnsira leV to provide a threaded elementfor receivingthe rod 9 independent ofthe ksleeve 5, the primary functionof said sleeve be' to secure together the interiitting parts 1an 2. Itisobviously within the scope4 of the invention to secure within theresonating chamber a suitable threaded member having no mechanicalconnection with the sleeve 5.

I claim:

1. A drum embodying therein a body com- MEYEB, Gl' M'.

e `channel construction also 2 e I y 17,541;

engaging channel portions includin annu ar angelike parts, a head andhea ringk on each end of the bodyz a tension hoop engaged with eachheadrmi, sleeves extend- 5 ing through said angeli e parts and securing themtogether, and tension rods operatively engaged with the tension hoopsand threaded into said sleeves in said angelike parte. 'y

2. A drum embodying thereina body comprising two body shell membershaving interengaglng channel portions including annular dan like parts,a head and ring on each end of t e' body,l sleeves extending throughsaidl angelke parts and securing them together,

- tensloln rods threaded into saidfsleevagbcoirner clps en 'ng portionso -sai Vo y shell membeigggaind said iange parts and through which saidsleeves also extend, and

nuts threaded on said sleeves securing l v o V said corner clips againstsaid ilange parts'. t

" 3. A; drum comprising a body shell having an annular channel portion''including topand bottom annular flangelike parts, a head an and aheadring on each end of the body l ,y n o shell, said" channel portionldefining an exi y v n 'f pansionchamberext'ending circumferentiallyabout the body; shell ata point between the ends thereof, a tension hoopengaged with Aaofeach. head ring, means for securing together -4 nsaidtop and bottom angelike parts, tension o n l y rods engaged with thetension hoonssaid f i rods extending 'through said top and bottom y vangelike partsyfand means in the channel l pidrtion for receiving theends of the tension r s. 4. A drum comprising a shell having anvenlarged intermediate portion to serveyas a resonatingchambenheadsstreacled over the 40 marginsof the shell. tension ringsengaging the margins of the heads, a 'plurality of tension rods engagingthe tension hoops. means in the resonating chamber for receiving thetension rods, and'reenforcing elements in the l l lreasonating chamber.y" j s f x f (s,

" 5; Adrumembodvingtherein. abodv'shell y f f i 'y s o ll'laving anannular channelnort'inn including f s `ton and bottom annular an'gelikeDarts( a head and head ring on veach `end' of the body shell. saidchannel 'portionsdefining an ex-` ,y Y pansion chamber extendingcircumferentially aboutthe bodyshell at apointbetween the 'ends thereof.a. tension' hoonA engaged with each head' ring. means fixed in said topMand L 5v5 bottom Hangelike narts for securing said i 'parts together,kand tension,v rods extending'y y y lthrough,said ton and bottom angelikenarts `eng'wredl fwith the tension hoops and operf atively securedinsaidlastment'ioned means. In testimony whereofl.' hereunto 'ax mysignature', s f

- RUSSELL HAGEN.

